body{
  height: 100vh;
  background: url(../images/gou.jpg) no-repeat center;
  background-size: cover;
}

.header-in {
  height: 80px;
  line-height: 80px;
  text-align: center;
  font-size: 22px;
  font-weight: 500;
  color: #fb7299;
}

.control-in {
  /* background-color: aqua; */
  text-align: center;
}
.control button{
    background-color: #fb7299;
    color: #fff;
    text-align: center;
    font-size: 16px;
    cursor: pointer;
    transition: background-color .3s;
    padding: 8px 20px;
    border-radius: 2px;
    
}

.control button:hover {
  background-color: #ed8ca8;
}

.stu-in {
  /* background-color: #ed8ca8; */
  /* height: 400px; */

}

.group h3{
  height: 40px;
  line-height: 40px;
  text-align: center;
}

.group h3 a{
  font-size: 14px;
  color: #3288dd;
  transition: all .3s;
}

.group h3 a:hover{
  font-weight: bold;
  color: #084f96;
  text-decoration: underline;
}

.group ul {
  display: flex;
  justify-content: center;
}


.group ul li {
  margin: 5px;
  width: 120px;
  height: 50px;
  line-height: 50px;
  box-sizing: content-box;
  border: 1px solid #f1f2f3;
  border-radius: 4px;
  background-color: #f6f7f8;
  color: #61666d;
  text-align: center;
  font-weight: 400;
  transition: background-color .3s, color .3s;
  position: relative;
}


.close-btn{
  width: 15px;
  height: 15px;
  line-height: 15px;
  position: absolute;
  right: 0;
  top: 0;
  cursor: pointer;
  transition: all .3s;
}

.close-btn:hover {
  color: #ffff;
  background-color: #db3752;
  border-top-right-radius: 4px;
}


.group ul li.active{
  background-color: #438cd4;
  color: #fff;
}

.countdown{
  text-align: center;
  color: #d699aa;
  font-size: 18px;
  padding: 5px 0;
  font-weight: 500;
}


